package test;

public class test02_HelloJava {
    public static void main(String[] args) {
        //TODO 变量 标识符
        String  name, old,a,Name;
        //变量声明
        name = "zhangsan";
        Name = "zhangsan2";
        old="13";
        a="90";
        //变量赋值
        System.out.println(name+old+a);
        System.out.println(Name);
        String xingming="lisi";
        String username="xiaoming";
        //标识符号只能采用_$下划线和美元，其他为特殊符号
        String $_name123="标识符+英文+数字";
        System.out.println($_name123);


    }
}
